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  <p>
    Reports unresolved expressions.
  </p>
  <p>
    An expression (key / value) in a definition declaration will be considered as unresolved in following situations:
  </p>
  <ul>
    <li>It's a key expression, but does not match any CWT expression.</li>
    <li>It's a key expression, but value expression of it does not match any CWT expression.</li>
    <li>It's a value expression, but does not match any CWT expression.</li>
  </ul>
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